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Basis of Reporting and Accounting (Tables) | 9 Months Ended
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Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Premium Receivable, Allowance for Credit Loss | The following table summarizes changes in our allowance for credit loss exposure on our premiums receivable:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(millions) | 2025 | 2024 |  | 2025 | 2024
Allowance for credit losses, beginning of period | $ | 501 |  | $ | 328 |  |  | $ | 460 |  | $ | 369 |
Increase in allowance 1 | 211 |  | 167 |  |  | 540 |  | 402 |
Write-offs 2 | (196) |  | (107) |  |  | (484) |  | (383) |
Allowance for credit losses, end of period | $ | 516 |  | $ | 388 |  |  | $ | 516 |  | $ | 388 |
1 Represents the incremental increase in other underwriting expenses. 2 Represents the portion of allowance that is reversed when the premiums receivable balances are written off. Premiums receivable balances are written off once we have exhausted our collection efforts.

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- Definition Tabular disclosure of allowance for credit loss on premium receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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